We have a project in ASP.net in which we use checkbox and list box. On this project, all the items selected from the checklistbox should be placed on the listbox. i don't have a problem in that. the problem is, everytime i select another item, the previous selected item still proceed into the listbox together with the currently selected item. i've tried using listbox1.items.clear(). it solves the problem but, it removes all the current items in the listbox everytime i make another selection. what will i do?